OctroTalk

Бесплатный проприетарный XMPP-клиент для мобильных устройств. Также существует версия для настольного компьютера.

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 OctroTalk. Mobile Instant Messaging with full voice integration. This always-on product keeps you connected with your buddies, and your buddies reach you whenever, wherever. Works seamlessly over GPRS/EDGE/CDMA/Wifi/Bluetooth data connections, and cuts down your phone bills. OctroTalk now supports GoogleTalk/Jabber, MSN, AIM, ICQ and Yahoo.
Features:
    * Always on connected to Google Talk/Jabber with MSN, AIM, ICQ and Yahoo transports
    * Complete VOIP product. Access to PSTN.
    * Supports Low Bandwidth Codec (even works with EDGE/GPRS/CDMA).
    * Streamlined UI. Optimized for one-handed operation. Today Screen on Pocket PC. Home Screen support for Smartphone.
    * Extremely fast P2P file transfer. Quick picture messaging. 
    * Low CPU usage. Only VOIP product that works on Treo 700w (300 MHz processor).
    * Secure and Encrypted connection to GoogleTalk. Google Talk messages are encrypted using industry standard TLS/SSL.
    * Message Archiving in your GMail Account.
    * Share files with your buddies (automated file transfer).
    * Access your computer remotely. Install OctroTalk for Windows on your desktop, and share a folder with OctroTalk on your Mobile.
    * Support for GroupChat/Conferencing. OctroTalk lets you create/join Jabber conference rooms.

Для мобильных устройств существуют версии для:

• Windows Mobile Smartphone
• Symbian S60 3rd Edition
• Windows Mobile Pocket PC

Скриншоты

Версия для настольных компьтеров:

Ссылки

• Официальный сайт